JP2012020501A - Method for recycling rubber of waste tire and recycling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recycling the rubber of a waste tire as a granule of high quality and below a specific granular diameter by blasting a combustion gas containing overheated steam or overheated steam to the crushing pieces of a waste tire, then melting the rubber at high temperatures and fractionating the molten rubber from other materials, as well as a recycling system.SOLUTION: First, the waste tire is instantaneously made to freeze by a coolant in a vacuum atmosphere and thereby, is made to lose its elasticity. Next, this non-elastic waste tire is crushed by striking or impact, and the combustion gas containing overheated steam or the overheated steam is blasted to the crushing pieces of the crushed waste tire, so that the rubber is made to melt. After that, the non-rubber materials such as carcass, belt and heat wire. which are used for the waste tire, are separated and then, the molten rubber is made to freeze again into a rubber lump. This rubber lump is charged into a bottomed rotary cylindrical vessel with numerous through-holes of specific caliber formed on the circumferential wall, then is cut and crushed by a rotary blade inside the cylindrical vessel. Finally, the rubber granules below a specific granular diameter are discharged to the outside of the cylindrical vessel via the through-holes by the centrifugal force accompanied by the rotation of the cylindrical vessel. Also the recycling system is provided.

Description

  The present invention relates to a method of crushing waste tires, separating rubber used in waste tires from other materials, and recycling the separated rubber as granular materials having a predetermined particle size or less. And other materials are separated by spraying superheated steam-containing combustion gas or superheated steam onto the crushed pieces of waste tires to melt the rubber, and the selection and collection of rubber particles below a certain particle size is melted. The present invention relates to a rubber recycling method and a recycling system for waste tires, which are performed using a centrifugal force after pulverizing a separated and re-frozen rubber lump.

With the widespread use of automobiles, a large number of used tires are piled up, and environmental destruction such as the occurrence of fire due to spontaneous firing of these piled tires has become a social problem, and reuse and recycling have become a major issue. ing.
As a method of reusing and recycling used tires that have been used, they can be used in their original form or cut and used as playground equipment, or they can be burned and used as a high calorie heat source. On the other hand, it is roughly crushed by a crushing device, and is applied in a strip shape to the inner surface of a carcass made of synthetic resin fibers or the like that is attached to the inner surface of the tire to reinforce the rubber portion of the tire, or the inner surface of the portion (tread) where the tire contacts the road surface Non-rubber materials such as belts made of synthetic resin fibers and the like, metal bead wires that support both ends of the carcass and fix the tire to the rim are separated from the rubber parts, and rubber and synthetic resin fibers Metals are also reused as resources.
However, when reusing the waste tire as a resource, it is difficult to peel off the non-rubber material from the rubber part and to separate it, and the separated rubber part is made of synthetic resin fiber or metal non-rubber material. If it is included, there is a problem that the commercial value of the recycled rubber product is lowered.

On the other hand, in order to pulverize a solid material and obtain a granular material having a constant particle size, the solid material pulverized by a pulverizer is put into a mesh sieving device corresponding to a predetermined particle size, and the sieving device is vibrated. It is generally performed to drop and collect powder particles having a certain particle size or less from the mesh of the sieve. Further, in order to efficiently collect coarse particles having a certain particle size or more remaining on the sieve without falling from the mesh of the sieve, the sieve is often inclined and arranged.
However, in this method, the solid material pulverized by the pulverizer must be transported to the top of the sieve, and even if a sieving device is provided in contact with the discharge port of the pulverizer, the coarse particles left behind are removed. In order to pulverize again with the pulverizer, it is necessary to convey the coarse granular material left by sieving to the inlet of the pulverizer by some means, and there has been a tendency to increase the size of the granular material manufacturing apparatus.

Therefore, the present inventor previously stated, “A freezing step of freezing a waste tire using a refrigerant such as a low-temperature liquefied gas, and crushing the frozen waste tire, and from a rubber portion, a non-rubber such as a carcass, a belt and a bead wire” A crushing separation process for separating the parts, a separation process for separating the crushed waste tires from rubber parts, and non-rubber parts such as carcass, belts and bead wires, and the separated rubber parts into a predetermined particle size. An invention of a freeze pulverization method and a freeze pulverization apparatus for waste tires provided with a pulverization step for pulverization was performed (Japanese Patent Laid-Open No. 2002-219378).
In this “waste tire freeze pulverization method and freeze pulverization apparatus”, the waste tire frozen from the freezing step to the crushing separation step, the waste tire crushing piece crushed from the crushing separation step to the separation step, and the separation step Therefore, it is not possible to downsize the entire apparatus because it is necessary to transport the non-rubber material crushed pieces and the separated rubber crushed pieces to the pulverization process.
Therefore, the present inventor conducted intensive research to make the apparatus more compact, and “pulverized the solid material put into the bottomed rotating body having a large number of through-holes having a constant diameter on the peripheral wall in the same cylindrical body. , A method for producing a granular material, in which a pulverized product is discharged to the outside from a large number of through holes having a constant diameter by a centrifugal force accompanying the rotation of the cylindrical body, and a granular material having a predetermined particle size or less is collected. Invented “Manufacturing apparatus” and invented “Rubber tire recycling method and recycling apparatus” using the “Powder production method and manufacturing apparatus” (Japanese Patent Application No. 2009- 169325).
However, even in this "method for recycling rubber from waste tires", waste tires that have been frozen and lost their elasticity are crushed by physical means, so that separation of rubber and other materials can be performed reliably. There is no guarantee that the rubber adhering to the crushed pieces of other materials larger than the sieve mesh to be separated will not be recycled, and conversely, the crushed pieces of other materials smaller than the sieve mesh will be put into the cylinder and crushed. There were some concerns that were released outside and affected the quality of recycled rubber.

JP 2002-219378 A

  In view of the above-mentioned background art, the present invention sprays superheated steam-containing combustion gas or superheated steam on a fragmented waste tire, melts rubber at high temperature, and separates it from other materials, thereby mixing other materials. A rubber recycling method and a recycling system for waste tires without waste are provided, and the recycled rubber is used to contribute to the improvement of product quality.

The present inventor has solved the above problems by the following means.
(1) A freezing process in which waste tires are instantly frozen with a refrigerant such as a low-temperature liquefied gas in a vacuum atmosphere to lose elasticity, a crushing process for crushing frozen tires that have lost elasticity, and crushing waste tires By blowing superheated steam-containing combustion gas or superheated steam onto the crushed pieces and melting the rubber, the material other than the rubber used for the carcass, belt, and heat wire of the tire and rubber are crushed from the crushed pieces of the waste tire. A melting / separation process for separating, a refreezing process for refreezing the molten rubber with a refrigerant such as a low-temperature liquefied gas, and a re-frozen rubber lump are put into a rotating cylinder having a large number of through-holes with a constant diameter on the peripheral wall. The rubber lump is pulverized by pulverizing means such as a number of rotary blades provided in the cylindrical body, and a through-hole having a constant diameter is formed on the peripheral wall of the cylindrical body by centrifugal force accompanying the rotation of the cylindrical body To release the rubber grinding granular material in a cylindrical outside, rubber recycling method of waste tire characterized by comprising a pulverizing and granulating step of collecting the rubber granules under constant particle diameter or less.

(2) The superheated steam-containing combustion gas sprays and burns fuel with a first burner to heat the combustion chamber to a high temperature of 700 ° C. or higher and mixes fuel and water from the second burner into the high-temperature combustion chamber. The rubber recycling method for waste tires according to item (1), which is obtained by injection combustion of an emulsion.
(3) The superheated steam sprays and burns fuel with a burner to heat the combustion chamber to a high temperature of 700 ° C. or higher, and water injected from one end of a loop-shaped water pipe disposed in the high-temperature combustion chamber The rubber recycling method for waste tires according to (1) above, wherein the method is obtained by heating in the water pipe and ejecting from the other end.

(4) A freezing device that instantaneously freezes a waste tire with a refrigerant such as a low-temperature liquefied gas in a vacuum atmosphere to lose elasticity, a crushing device that crushes a frozen waste tire that has lost elasticity, and a crushing waste tire By blowing superheated steam-containing combustion gas or superheated steam onto the crushed pieces and melting the rubber, the material other than the rubber used for the carcass, belt, and heat wire of the tire and rubber are crushed from the crushed pieces of the waste tire. A melting / sorting device for separating, a refreezing device for refreezing the molten rubber with a refrigerant such as a low-temperature liquefied gas, and a bottomed rotating cylinder having a plurality of through holes of a constant diameter on the peripheral wall The rubber mass is cut and pulverized by a large number of rotary blades provided in the cylindrical body, and from a through-hole having a constant diameter on the peripheral wall of the cylindrical body by centrifugal force accompanying the rotation of the cylindrical body. To release the beam milling granular material into a cylindrical outside, rubber recycling system of the waste tires, characterized by comprising is composed of a granulating device of solid lumps of collecting rubber granules under constant particle diameter or less.
(5) The solid lump granulation apparatus includes a rotary blade body in which a large number of rotary blades are fixed vertically along a suspended rotary shaft, and the rotary blade body is movable up and down. The rubber recycling system for waste tires according to item (4), wherein the rubber recycling system is disposed in a bottom rotating cylinder.

The following effects are exhibited by the “method and system for recycling waste tire rubber” of the present invention.
<1> The waste tire is instantly frozen in a vacuum atmosphere with a refrigerant such as a low-temperature liquefied gas, and loses its elasticity as a rubber to facilitate crushing. Since the rubber is melted by blowing superheated steam, non-rubber materials such as carcass, belt and beat wire can be separated almost completely from rubber, and the melted rubber can be separated by a refrigerant such as low-temperature liquefied gas. The re-frozen and re-frozen rubber mass is put into a rotating cylinder having a large number of through-holes with a constant diameter on the peripheral wall and crushed by crushing means comprising a number of rotating blades provided in the cylinder, and the cylinder Rubber particles crushed from the through-holes with a constant diameter on the peripheral wall of the cylindrical body are discharged out of the cylindrical body by centrifugal force accompanying the rotation of the body, and rubber particles with a predetermined particle diameter or less are collected. Easily obtain rubber particles with a uniform particle size without contamination by outside materials, contribute to improving the quality of products made from recycled rubber, and prevent environmental pollution due to piled up waste tires and illegal dumping Can also contribute.

<2> A freezing device that instantaneously freezes a waste tire with a refrigerant such as a low-temperature liquefied gas in a vacuum atmosphere and loses elasticity; a crushing device that crushes frozen waste tires that have lost elasticity; By blowing superheated steam-containing combustion gas or superheated steam onto the crushed pieces and melting the rubber, the material other than the rubber used for the carcass, belt, and heat wire of the tire and rubber are crushed from the crushed pieces of the waste tire. A melting / sorting device for separating, a refreezing device for refreezing the molten rubber with a refrigerant such as a low-temperature liquefied gas, and a bottomed rotating cylinder having a plurality of through holes of a constant diameter on the peripheral wall The rubber mass is cut and pulverized by a large number of rotary blades provided in the cylindrical body, and from a through-hole having a constant diameter on the peripheral wall of the cylindrical body by centrifugal force accompanying the rotation of the cylindrical body. It is composed of a solid lump granulator that discharges pulverized particles outside the cylinder and collects rubber particles of a certain particle size or less, so the rubber of waste tires is melted by carcass, belt, heat Recycled rubber that is completely separated from wires and other materials and is not mixed with other materials can be obtained.
The solid lump granulation apparatus includes a rotary blade body in which a large number of rotary blades are fixed vertically along a suspended rotary shaft, and the rotary blade body is freely movable up and down. Since it is disposed in the rotating cylinder, the re-frozen rubber lump can be efficiently cut and crushed.

Block diagram showing the steps of the rubber recycling method for waste tires Explanatory drawing showing the configuration of the rubber recycling system for waste tires

The form for implementing the rubber recycling method and recycling system of the waste tire of this invention is demonstrated based on the figure of an Example.
As shown in FIG. 1, the rubber recycling method for waste tires of the present invention removes a metal rim from a used waste tire and performs a pretreatment step S1 for cleaning and removing mud and dirt adhering to the tire. After performing, the freezing step S2 in which the waste tire is instantaneously frozen in a vacuum atmosphere with a refrigerant such as a low-temperature liquefied gas to lose elasticity, the crushing step S3 in which the waste tire that has been frozen and loses elasticity is crushed, By blowing superheated steam-containing combustion gas or superheated steam onto the crushed pieces of the waste tire, the rubber is melted in an atmosphere of 400 to 500 ° C. and used from the crushed pieces of the waste tire to the carcass, belt, and heat wire of the tire. A melting / separating step S4 for separating the material other than the rubber and the rubber, a refreezing step S5 for refreezing the molten rubber with a refrigerant such as a low-temperature liquefied gas, Into the bottomed rotating cylinder having a large number of through-holes having a constant diameter, and crushing the rubber lump by a crushing means comprising a number of rotating blades provided in the cylinder, and centrifuging with rotation of the cylinder The rubber pulverized particles are discharged out of the cylindrical body from the through-holes having a constant diameter on the peripheral wall of the cylindrical body by force, and the mixture of raw materials other than rubber passes through the pulverizing and sizing step S6 in which rubber particles having a predetermined particle diameter or less are collected. It is intended to obtain a rubber granule having a uniform particle size.

FIG. 2 shows an example of a system for realizing the method for recycling rubber tire rubber according to the present invention. In the figure, 11 is a freezing device, 12 is a crushing device, 13 is a melting / sorting device, 14 is a refreezing device, 15 is a superheated steam generator, 16 is a granulating device for solid lump, 2 is pulverizing / sizing Rotating cylindrical body of the apparatus, 2a is a through hole, 3 is a rotating blade body, 3a is a rotating blade, 4 is a granular material collecting part, and 4a is a granular material outlet.
As shown in FIG. 2, the rubber recycling system for waste tires of the present invention includes a freezing device 11 that instantaneously freezes waste tires with a refrigerant such as a low-temperature liquefied gas in a vacuum atmosphere, and loses elasticity. A crushing device 12 that crushes a waste tire that has been easily destroyed by losing the air, for example, by hitting or impacting with a swing hammer or the like, and a superheated steam-containing combustion gas generated in a crushing piece of the crushed waste tire in a superheated steam generator 15 Alternatively, by blowing superheated steam to melt the rubber in an atmosphere of 400 to 500 ° C., the scrap pieces of the waste tire are made of a material other than the rubber used for the carcass, belt, and heat wire of the tire and the rubber. A melting / sorting device 13 for separating; a refreezing device 14 for re-freezing the melted rubber with a refrigerant such as a low-temperature liquefied gas; The lump is put into a bottomed rotating cylindrical body 2 having a large number of through holes 2a having a constant diameter on the peripheral wall, and the rubber lump is cut and pulverized by a large number of rotating blades 3a provided in the cylindrical body 2, Particles that are not mixed with non-rubber materials are discharged to the outside of the cylindrical body 2 by pulverizing the rubber granular body having a predetermined particle diameter or less pulverized from the through-hole 2a having a constant diameter on the peripheral wall of the cylindrical body by centrifugal force accompanying the rotation of the cylindrical body 2 1 and a solid lump granulating device 16 that collects rubber granules having a uniform diameter in a granule collecting portion, and according to the steps shown in FIG. To produce rubber granules.
And since the molten rubber melted by the melting / sorting device can be sent to the refreezing device via a flow path such as a pipe, a conveying device such as a belt conveyor or a bucket is not necessary, and the system can be made compact. Work time can be shortened.

  The superheated steam generator 15 generates superheated steam or a combustion gas containing superheated steam, and the generator of the superheated steam containing combustion gas sprays and burns fuel from the first burner so that the temperature in the combustion chamber is 700 ° C. or higher. And a superheated steam-containing combustion gas is obtained by injecting and burning an emulsion obtained by mixing fuel and water from a second burner into the high-temperature combustion chamber. The fuel is spray-combusted to heat the combustion chamber to a high temperature of 700 ° C. or higher, and water is injected from one end of a loop-shaped water pipe disposed in the high-temperature combustion chamber. It is heated and ejected as superheated steam from the other end.

  The solid lump granulating device used in the rubber recycling system for waste tires of the present invention is not only rubber lump but also plastic, metal, ceramics, glass, slag, asphalt, stone, wood, food, medicine, It can also be used as a granulating device for lump in feed and fertilizer.

2: Rotating cylindrical body 2a: Through hole 3: Rotating blade body 3a: Rotating blade 4: Granular material collection unit 11: Freezing device 12: Crushing device 13: Melting / sorting device 14: Refreezing device 15: Superheated steam generator 16 : Solid lump granulator

Claims (5)

  Freezing process that instantly freezes waste tires in a vacuum atmosphere with a refrigerant such as low-temperature liquefied gas and loses elasticity, crushing process that crushes waste tires that have been frozen and lost elasticity, and shredded pieces of waste tires Melting rubber by blowing superheated steam-containing combustion gas or superheated steam to separate rubber from materials other than rubber used for carcass, belt and heat wire of the tire from the crushed pieces of the waste tire A separation step, a refreezing step in which the melted rubber is refreezed with a refrigerant such as a low-temperature liquefied gas, and the re-frozen rubber lump is put into a rotating cylinder with a bottom having a large number of through-holes on the peripheral wall, The rubber lump is cut and pulverized by a number of rotary blades provided in the cylindrical body, and rubber powder is discharged from a through-hole having a constant diameter on the peripheral wall of the cylindrical body by centrifugal force accompanying the rotation of the cylindrical body. To release the granules into a cylindrical outside, rubber recycling method of waste tire characterized by comprising a pulverizing and granulating step of collecting the rubber granules under constant particle diameter or less.   The superheated steam-containing combustion gas, which is blown onto the crushed waste tire fragments and melts the rubber, sprays and burns fuel with the first burner to heat the combustion chamber to a high temperature of 700 ° C. or higher and into the high-temperature combustion chamber. 2. The method for recycling rubber tires according to claim 1, which is obtained by injection combustion of an emulsion obtained by mixing fuel and water from a second burner.   Superheated steam that blows on the crushed waste tire fragments and melts the rubber sprays and burns fuel with a burner to heat the combustion chamber to a high temperature of 700 ° C. or higher and is disposed in the high-temperature combustion chamber. 2. The method of recycling rubber for waste tires according to claim 1, wherein water injected from one end of the loop-shaped water pipe is obtained by being heated in the water pipe and ejected from the other end.   Freezing equipment that instantaneously freezes waste tires with a refrigerant such as low-temperature liquefied gas in a vacuum atmosphere and loses elasticity, crushing equipment that crushes waste tires that have been frozen and lost elasticity, and pieces of crushed waste tires Melting rubber by blowing superheated steam-containing combustion gas or superheated steam to separate rubber from materials other than rubber used for carcass, belt and heat wire of the tire from the crushed pieces of the waste tire -A separation device, a refreezing device that refreezes molten rubber with a refrigerant such as a low-temperature liquefied gas, and a re-frozen rubber lump into a rotating cylinder with a bottom having a large number of through-holes on the peripheral wall, The rubber lump is cut and pulverized by a number of rotary blades provided in the cylindrical body, and rubber powder is discharged from a through-hole having a constant diameter on the peripheral wall of the cylindrical body by centrifugal force accompanying the rotation of the cylindrical body. To release the granules into a cylindrical outside, rubber recycling system of the waste tires, characterized by comprising is composed of a granulating device of solid lumps of collecting rubber granules under constant particle diameter or less. The granulated apparatus for a solid lump includes a rotary blade body in which a large number of rotary blades are fixed vertically along a suspended rotary shaft, and the rotary blade body is movable up and down, and the bottomed rotary cylinder The rubber recycling system for waste tires according to claim 4, wherein the system is disposed in the body.

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